aperture

絞り、開口

カメラなどの機器で、入る光の量を調節する開口部。

やさしい英語で： An opening in a camera or other instrument that controls how much light enters.

• Open the aperture to let in more light.
• A narrow aperture keeps more of the scene sharp.
• The camera adjusts its aperture automatically.

よく使う表現： camera aperture, wide aperture

口径

光を取り入れる開口部や、望遠鏡の主なレンズの直径。

やさしい英語で： The width of a light opening or a telescope’s main lens.

• This telescope has a large aperture.
• The aperture measures ten centimetres across.
• A greater aperture allows us to see fainter stars.

よく使う表現： large aperture, telescope aperture

開口部、穴

何かが通り抜けられる、小さな穴や狭い開口部。

やさしい英語で： A small or narrow hole that something can pass through.

• Light entered through a small aperture.
• He looked through an aperture in the wall.
• The stone had several narrow apertures.

使い方： aperture in something (There was an aperture in the metal cover.)

類義語： opening, hole, gap

よく使う表現： narrow aperture, aperture in something

衛星アンテナ

衛星通信に使う信号を送ったり受けたりする大きなアンテナ。

やさしい英語で： A large antenna that sends or receives signals used in satellite communication.

• The station uses a large aperture.
• Engineers installed a second aperture to receive satellite signals.
• Each aperture points towards a different satellite.

類義語： antenna

よく使う表現： satellite aperture, large aperture